COMPLIANCE INFO_JTD 9/3/2025 - Laserfiche WebLink

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3-14 Note, since installation, there have been no significant problems with the FSL stormwater management / drainage system in controlling runoff from the FSL site. 3.2.1 Final Cover System Corrective Action / Repair Costs The following assumptions were made to assess the corrective action / repair costs for the FSL final cover system impacted by the 1,000-year, 24-hour storm event — the CalRecycle precipitation causal event BMP:  Area of disturbed final cover requiring repair assumed equal to 10% of the total final cover area equal to (674 acres) x (10%) = 67.4 acres  Average depth beneath disturbed final cover area equal to 1-foot  One-half (1/2) of the final cover area repaired will require excavation, and one-half (1/2) will require fill  Final cover area repaired will require final grading, seeding, mulch, and surveying 3.2.2 Stormwater Management / Drainage System Corrective Action / Repair Costs The following assumptions were made to assess the corrective action and associated repair costs for the FSL stormwater management / drainage system impacted by the 1000-year, 24-hour storm event — the CalRecycle precipitation causal event BMP:  Area of disturbance requiring repair assumed equal to the total area of the three sedimentation basins plus the perimeter drainage ditch equal to: o Sedimentation Basins = (8.5 acres + 1.5 acres + 2.5 acres) = 12.5 acres, o Perimeter Ditch = 2.5 acres (estimated total ditch length of 10,745 feet, and assumed average width of 10 feet);  Average depth of disturbance equal to 1-foot.  One-half (1/2) of the disturbed area will require excavation, and one-half (1/2) will require fill.  Disturbed areas will require final grading and surveying. A corrective action cost of $1,574,772 was estimated for the Precipitation Causal Event. The detailed cost breakdown is provided on Table 2, with stated assumptions and quantity takeoffs.